i was diagnosed with kp when i was 13 by a dermatologist. my mum took me to my doctor when i was a bit younger and it took her years of pestering them to finally do something about it. i had kp on my arms, legs, face and back. on my face it just appeared red. they gave me retin-a gel which is a chemical exfoliant. it worked kind of but in the end i just resigned myself to growing out of it which finally at 23 i pretty much have.
here are things i found to work:
sunshine (not burning!!), it gets better in summer and worse in winter.
moituriser helps a lot
exfoliation
hope that helps. this condition made me miserable for years and i spent a long time searching for a cure, sadly there isnt one. but the above things should help make it less noticeable until you grow out of it